diff --git a/routers/web/repo/view.go b/routers/web/repo/view.go
index 576e17a4f9..d199bd016c 100644
--- a/routers/web/repo/view.go
+++ b/routers/web/repo/view.go
@@ -681,7 +681,7 @@ func checkHomeCodeViewable(ctx *context.Context) {
 			}
 
 			unit, ok := unit_model.Units[repoUnit.Type]
-			if ok && (firstUnit == nil || !firstUnit.IsLessThan(unit)) {
+			if ok && (firstUnit == nil || !firstUnit.IsLessThan(unit)) && repoUnit.Type.CanBeDefault() {
 				firstUnit = &unit
 			}
 		}
diff --git a/tests/integration/repo_test.go b/tests/integration/repo_test.go
index f0056dbdad..60e156a684 100644
--- a/tests/integration/repo_test.go
+++ b/tests/integration/repo_test.go
@@ -11,6 +11,10 @@ import (
 	"testing"
 	"time"
 
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	unit_model "code.gitea.io/gitea/models/unit"
+	"code.gitea.io/gitea/models/unittest"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/test"
 	"code.gitea.io/gitea/tests"
@@ -701,3 +705,101 @@ func TestCommitView(t *testing.T) {
 		assert.Contains(t, commitTitle, "Initial commit")
 	})
 }
+
+func TestRepoHomeViewRedirect(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	t.Run("Code", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", "/user2/repo1")
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		doc := NewHTMLParser(t, resp.Body)
+		l := doc.Find("#repo-desc").Length()
+		assert.Equal(t, 1, l)
+	})
+
+	t.Run("No Code redirects to Issues", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Disable the Code unit
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+		err := repo_model.UpdateRepositoryUnits(db.DefaultContext, repo, nil, []unit_model.Type{
+			unit_model.TypeCode,
+		})
+		assert.NoError(t, err)
+
+		// The repo home should redirect to the built-in issue tracker
+		req := NewRequest(t, "GET", "/user2/repo1")
+		resp := MakeRequest(t, req, http.StatusSeeOther)
+		redir := resp.Header().Get("Location")
+
+		assert.Equal(t, "/user2/repo1/issues", redir)
+	})
+
+	t.Run("No Code and ExternalTracker redirects to Pulls", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Replace the internal tracker with an external one
+		// Disable Code, Projects, Packages, and Actions
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+		err := repo_model.UpdateRepositoryUnits(db.DefaultContext, repo, []repo_model.RepoUnit{{
+			RepoID: repo.ID,
+			Type:   unit_model.TypeExternalTracker,
+			Config: &repo_model.ExternalTrackerConfig{
+				ExternalTrackerURL: "https://example.com",
+			},
+		}}, []unit_model.Type{
+			unit_model.TypeCode,
+			unit_model.TypeIssues,
+			unit_model.TypeProjects,
+			unit_model.TypePackages,
+			unit_model.TypeActions,
+		})
+		assert.NoError(t, err)
+
+		// The repo home should redirect to pull requests
+		req := NewRequest(t, "GET", "/user2/repo1")
+		resp := MakeRequest(t, req, http.StatusSeeOther)
+		redir := resp.Header().Get("Location")
+
+		assert.Equal(t, "/user2/repo1/pulls", redir)
+	})
+
+	t.Run("Only external wiki results in 404", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Replace the internal wiki with an external, and disable everything
+		// else.
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+		err := repo_model.UpdateRepositoryUnits(db.DefaultContext, repo, []repo_model.RepoUnit{{
+			RepoID: repo.ID,
+			Type:   unit_model.TypeExternalWiki,
+			Config: &repo_model.ExternalWikiConfig{
+				ExternalWikiURL: "https://example.com",
+			},
+		}}, []unit_model.Type{
+			unit_model.TypeCode,
+			unit_model.TypeIssues,
+			unit_model.TypeExternalTracker,
+			unit_model.TypeProjects,
+			unit_model.TypePackages,
+			unit_model.TypeActions,
+			unit_model.TypePullRequests,
+			unit_model.TypeReleases,
+			unit_model.TypeWiki,
+		})
+		assert.NoError(t, err)
+
+		// The repo home ends up being 404
+		req := NewRequest(t, "GET", "/user2/repo1")
+		req.Header.Set("Accept", "text/html")
+		resp := MakeRequest(t, req, http.StatusNotFound)
+
+		// The external wiki is linked to from the 404 page
+		doc := NewHTMLParser(t, resp.Body)
+		txt := strings.TrimSpace(doc.Find(`a[href="https://example.com"]`).Text())
+		assert.Equal(t, "Wiki", txt)
+	})
+}